public class SepiaToneFilter: ColorMatrixFilter {
    override public init() {
        super.init()

        ({
            colorMatrix = Matrix4x4(rowMajorValues: [
                0.3588, 0.7044, 0.1368, 0.0,
                0.2990, 0.5870, 0.1140, 0.0,
                0.2392, 0.4696, 0.0912, 0.0,
                0.0, 0.0, 0.0, 1.0,
            ])
        })()
    }
}
